Absent from forums as of late due to not being able to drive my car really since June because clutch and torn left ACL/MCL don't mix..

Pulled into my dad's driveway tonight and heard an odd noise and just kept driving up the driveway just fine.. my dad looked and found a mystery bolt still warm so clearly off the car

I have reason to believe it's a suspension bolt but I'm towing it to the shop tomorrow night to find it's home.. just looking for a head start if anyone recognizes where this may have come from..

Image taken next to computer mouse for size reference.

UPDATE: So the winner is QAfred it was bolt #5, #2 was loose too and we couldn't reach the top two very well even with swivel sockets.. I will be speaking with that shop in the morning to have this addressed...